/*
 * Copyright 2021 ZhongChao Blockchain Technology Research Institute.
 *
 * Copyright ConsenSys AG.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * This file has been modified by ZhongChao Blockchain Technology Research Institute to add support for Brochain.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
package link.luyu.plugin.brochain.trie;

import java.util.function.Consumer;

public class AllNodesVisitor<V> implements NodeVisitor<V> {

    private final Consumer<Node<V>> handler;

    AllNodesVisitor(final Consumer<Node<V>> handler) {
        this.handler = handler;
    }

    @Override
    public void visit(final ExtensionNode<V> extensionNode) {
        handler.accept(extensionNode);
        acceptAndUnload(extensionNode.getChild());
    }

    @Override
    public void visit(final BranchNode<V> branchNode) {
        handler.accept(branchNode);
        branchNode.getChildren().forEach(this::acceptAndUnload);
    }

    @Override
    public void visit(final LeafNode<V> leafNode) {
        handler.accept(leafNode);
    }

    @Override
    public void visit(final NullNode<V> nullNode) {}

    private void acceptAndUnload(final Node<V> storedNode) {
        storedNode.accept(this);
        storedNode.unload();
    }
}
